Threading die



June 5, 1928. 1,672,676

c. F cox THREADING DIE Original F iled May 11, 1925 2 Sheets-Sheet l June 5, 1928. 1,672,676

. c. F. cox

THREADING DIE Original Filed May 11, 1925 2 Sheets-Sheet, 2

Patented June 5, 1928.

' UNITED STATES PATENT OFFICE.

CHARLES IF. COX, 0F BRIDGETON, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO LANDIS MACHINE COMPANY, OF WAYNESBORO, PENNSYLVANIA, A COBPOBA- TION OF PENNSYLVANIA.

Application filed May 11, 1925, Serial No. 29,437.

This invention relates particularly to threadingdies having tangentially arranged chascrs and the construction is in some respects similar to that shown in the application of Warren E. Glaspey and Frederick W. Cox for pipe threading dies, Ser. No. 598,575, filed Nov. 2, 1922, and in the application of Frederick 1V. Cox and myself for pipe threading dies, Ser. No. 656,486, filed August 9, 1923. I

The principal object of the present invention is to provide in a threading die of the I kind referred to an improved construction for the chaser and for the chaser holding clamp whereby the chaser is more firmly I held against its seat and is more firmly held against longitudinal noven'ient under the reaction of the cut.

In the accompanying drawing I have shown the embodiment of the invention which I now deem preferable, but it will be understood that the drawing is for illustrative purposes onlyand. that changesmay be made within the scope of the claims without departing from the spirit of the invention.

Of the drawings:

Fig. chaser Fig.

Fig. chaser Fig.

holder, the clamp being removed. 2 is a plan view of the clamp.

holder, the clamp being removed. 4 is a rear view of the clamp.'

Fig. 5 is a perspective view of the chaser.

Fig. 6 is an end view showing theposition of the clamp \vhcn.the chaser is in its rear-most position. This is the condition which prevails with a new chaser.

Fig. 7 a View similar to Fig. 6 but showing the chaser in a relatively extended position. This is the condition which prevails when the chaser has been reduced in length by repeated sharpenings.

'Referring to the drawings, 1 represents a chaser of the tangential type having longitudinal thread cutting teeth2 on the face thereof. The chaser is also provided with a longitudinal bearing surface 3-which is preferably located along one edge and which is beveled or inclined with respect to the front face and also with respect to the back surface l. Located in opposed relation to the beveledsurface 3 is a clamping surface 5 1 is a plan view of the chaser and 3 is a rear view of the chaser and,

THIR/EADING DIE.

Renewed April 22, 1926.

which also extends longitudinally of the chaser. This clamping surface is immediately adjacent the back surface 4 and is pref erably in a plane separated from the corresponding edge of the chaser. The chascr is also provided with a longitudinalgroove 6 which is immediately adjacent the clamping surface 5 and which is provided With a wall 7 immediately adjacent and at an angle to the said clamping surface 5.

The chaser holder is represented at 8 and this can be of any usual or preferred type. Ordinarily this chaser holder will be so constructcd that it can be movably mounted ina suitable die body and moved inward or outward to adjust the die for different diameters of work. The chaserholer 8 is providod with a bearing surface 9 which is adapted to engage the beveled surface 0 of the chaser and is also provided with a bearing surface 10 which is adapted to engage the-back surface i of the chaser. The body 8 is further provided with a longitudinally extending transversely inclined surface 11 which is located above the main part of the body and adjacent the clamping surface 5 and the groove 6 of the chaser.

The clamp for holding the chaser in place on the body is shown at 12. This clamp is provided with holes 13 adapted to receive bolts 14. These bolts are threaded into the bodyv and serve toconnect the clamp with the body and to draw the clamp downward .into clamping engagement with the chaser.

The clamp has a clamping surface 15 ada iited to engage the surface 5 of the chaser and it also has a hook portion 16 which is adapted to enter the groove 6 and engage the wall 7 thereof. The clamp. is further provided with a heel portionlT which preferably has an inclined surface 18 adapted to engage with the beveled surface 11 on the body. It will be seen that when the clamp is drawn downward by means of the bolts 14, it will serve to force the chaser downward and backward against the bearing surfaces 9 and 10 of the body.

' The clamping surface 5 of the chaser and the beveled bearing surface 3 thereof, instead of being parallel converge'toward the rear end of the-chaser, that is, they converge from the front cutting end of the inclination of the bearing surface. 5 and the beveled surface 11 of the holder is also inclined longitudinally downward to conform to the said inclination. As the result of the inclination of the before-mentioned surfaces, the clamp is enabled to hold the chaser more securely thanitotherwise could. It will be obvious that any rearward longitudinal movement of the chaser could occur only by actually raising the clamp up bodily against the tension of the bolts 14.

ln addition to the inclination of the clamping surface as described, I also prefer to transversely incline the groove 6 so that the wall 7 thereof converges rearwardly towards the back surface of the chaser from the front end thereof to the rear end there of. The'hook portion 16 of the clamp similarly inclined and the beveled surface 11 of the holder is also inclined transversely to conform to the inclination of the wall '7. As the result of this construction it will be apparent that the clamp still further aided in holding the chaser against rearward longitudinal movement. It will be obvious that even if the surfaces 5 and 15.

were not inclined, any rearward movement of the chase a could occur only by forcing the clamp toward the right as viewed in Figs. 6 and 7 and forcing it up the beveled surface 11. Obviously no such movement of the clamp could occur without actually breaking or elongating the bolts 14.

With the inclination of both the clampingsurface 5 and the groove wall 7. a. co1nbined' action is attained which makes it practically impossible for any rearward movement of the chaser to occur. This combined action will be more clearly understood from, a study of Figs. 6 and 7. Fig. 7 shows the chaser relatively projected. this. being the position which the chaser will take after repeated sharpening. It will be clear that any rearward movement. of the chaser with respect to the holder and the clamp could occur only by forcing the clamp upward and laterally to a position approximating that shown in Fig. 6. With my improved construction therefore, I make use not only of the frictional engagement between the several surfaces, but I make it mechanically impossible for the chaser to move without actually moving the clampaway fro-m the holder.

In order to further assist in'preventing any rearward movement of the chaser. the

tions will either bite into the'surface of the clamp or will mesh with similar serrations which may be formed on the surface of the clamp.

What I claim is:

1. A chasing tool provided with longitudinal thread cutting teeth on one face thereof and having integral opposed longitudinal clamping surfaces which converge fro-m the cutting end of the chaser toward the opposite end.

2. A chasing tool provided with longit-u-' dinal thread cutting teeth on one face thereof and having integral opposed longitudinal clamping surfaces one of which extends parallel with the cutting teeth while the other is inclinedand converges rearwardly toward the opposed clamping surface.

3. A chasing tool provided with longitudinal thread cutting teeth on the front face thereof and having longitudinal opposed clamping surfaces, said tool including also a longitudinal wall adjacent and at an angle to one of said clamping surfaces, which wall. converges with the back surface of the tool and from the cutting end of the chaser toward the opposite end.

t. A chasing tool provided with longitudinal thread cutting teeth on the front face thereof and having opposed longitudinal damping surfaces, said tool comprising also av longitudinal groove with a wall adjacent and at an angle to one of said clampingsurfaces and converging with the back face of said tool from. the cutting end thereof toward the opposite end.

5. The combination of a chaser provided.

opposite end, and a. holder for said "chaser including converging surfaces adapted for close engagen'ient'with the said converging surfaces of the chaser.

6. The combination of a chaser provided with longitudinal thread cutting teeth on one face thereof and having opposed longitudinal clamping surfaces which converge from the cutting end of the. chaser toward the opposite end. and a chaser holder .having relatively adjustable parts constituting a clamp adapted to grip the chaser by engaging said opposed clamping surfaces.

7. In a threading die, the combination of a chaser provided with longitudinal thread cutting teeth on one face thereofand having a longitudinal beveled bearing surface and an opposed longitudinal clamping surface, the said bearing surface extending parallelly with the cutting teeth and the clamping surface being inclined and converging rearwardlv toward the bearing surface, a chaser holder having a beveled seat engaging the beveled bearing surface of the chaser,

and a clamp connected to the holder and having a. clamping surface which engages the clamping surface of the chaser and is similarly inclined.

8. In a threading die, the combination of a chaser provided with longitudinal thread cutting teeth on one face thereof and having a longitudinal beveled bearing surface and an opposed longitudinal clamping surface and also having a wall adjacent and at an angle to the clamping surface, the said bearing surface extending parallelly with the cutting teeth and the said wall being inclined and conver ing rearwardly toward the back of the chaser, a chaser holder having a beveled seat engaging the beveled bearing surface of the chaser, and a clamp having a clamping surface which engages the clamping surface of the chaser and also having a hook portion which engages the aforesaid inclined Wall and is similarly inclined.

9. In a threading die, the combination of a. chaser provided with longitudinal thread cutting teeth on one face thereof and having a longitudinal beveled bearing surface and an opposed longitudinal clamping surface and also having a longitudinal groove with a wall adjacent and at an angle to the clamping surface, the said bearing surface extending parallelly with the cutting teeth and the said wall of the groove being inclined and converging rearwardly toward the back of the chaser, a chaser holder having a beveled seat engaging the beveled bearing surface of the chaser, and a clamp connected to the holder and having a clamping surface which engages the clamping surface of the chaser and also having a hook portion which enters the groove in the chaser and engages the aforesaid inclined wall and is similarly inclined.

10. In a threading die, the combination of a chaser provided with longitudinal thread aitting teeth on one face thereof and having a longitudinal beveled bearing surface and an opposed longitudinal clamping surface and also having a longitudinal wall adjacent and at an angle to the clamping surface, the said bearing surface extending parallelly with the cutting teeth and the clamping surface being inclined and converging rearwardly toward the bearing surface and the said wall being inclined and converging rearwardly toward the back of the chaser, a chaser holder having a beveled seat engaging the beveled bearing surface of the chaser, and a clamp having a clamping surface which engages the clamping surface of the chaser and is similarly inclined and also having a hook portion which engages the aforesaid inclined wall and is similarly inclined.

11. In a threading die, the combination of a chaser provided with longitudinal thread cutting teeth onone face thereof and having a longitudinal beveled bearing surface and an opposed longitudinal clamping surface, the said bearing surface extending parallelly with the cutting teeth and the clamping surface being inclined and converging rearwardly toward the bearing surface, a chaser holder provided with hearing surfaces respectively engaging the beveled bearing surface and the back of the chaser, the said holder also being provided with a transversely beveled surface which is also longitudinally inclined to conform to the inclination of the clainping surface on the chaser, and a clamp connected to the holder and having'surfaccs which respectively engage the inclined clamping surface of the chaser and, the similarly inclined beveled surface of the holder.

12. In a threading die, the combination of a chaser provided with longitudinal thread cutting teeth on one face thereof and having a longitudinal beveled surface and an opposed longitudinal clamping surface and also having a longitudinal groove with a wall adjacent and at an angle to the clamp' ing surface, the said bearing, surface extending parallelly with'the cutting teeth and the said wall of the groove being inclined and converging rearwardly toward the back of the chaser, a chaser holder provided with bearing surfaces respectively engaging the beveled bearing surface and the back of the chaser, the said holder also being provided with a transversely'beveled surface which is also longitudinally inclined to conform to the inclination of the said wall of the groove, and a clamp connected to the holder and having surfaces which respectively engage the clamping surface of the chaserand the longitudinally inclined beveled surface of the holder, the said clamp also having a hook portion which enters the groove in the chaser and engages the aforesaid inclined wall and is similarly inclined.

13. In a threading die, the combination of a chaser provided with longitudinal thread cutting teeth on one face thereof and having a longitudinal beveled bearing surface and an opposed longitudinal clamping surface and also having a longitudinal groove with a wall adjacent and at an angle to the clamping surface, the said bearing surface extending parallelly with the thread grooves and the clamping surface being inclined and converging rearwardly toward the bearing surface, and the said wall of the groove being inclined and converging rearwardly toward the back of the chaser, a chaser holder provided with bearing surfaces respectively engaging the beveled bear- .ing surface and the back of the chaser, the

said holder also being provided with a transversely beveled surface which is also longitudinally inclined to conform to the inclination of the said clamping surface on the chaser and theinclination of the said wall of the groove, and a clamp connectec 'to the holder and having surfaces which respectively engage the inclined clamping surfaces of the chaser and the longitudinally inclined beveled surface of the holder, the

said clamp also having a hook portion which enters the groove in the chaser and ei'igages the aforesaid inclined Wall and 1s similarly inclined.

14-. in a threading die, the combination of a chaser provided with longitudinal thread cutting teeth on one face thereof and having a longitudinal beveled bearing surface and an opposed longitudinal clan'1p-' longitudinal clamping surface which converge from the cutting end of the chaser to the opposite end.

16. For athreading die, a chaser provided with longitudinal thread cutting teeth on one face thereof and having a longitudinal beveled bearing surface and an opposed longitudinal clamping surface, the said bearing surface extending parallelly with the thread grooves and the clamping surface being inclined and converging rearwardly toward the bearing surface. I

17. F or a threading die, at chaser provided with longitudinal thread cutting teeth on one face thereof and having a longitudinal Ylwveled bearin surface and an opposed. lengitiuliual clamping surface and also having a longitudinal groove with a wall adjacent and at an angle to the clamping surface, the said bearing surface extending pa-rallelly with the thread grooves and the said wall of the groove being inclined and converging rearwardly toward the hack of the chaser.

18. For a threading die, a chaser provided with longitiulinal thread cutting teeth on one face thereof and having a longitudinal beveled bearing surface and an opposed longitudinal clamping surface and also having a longitudinal groove with a wall adjacent and at an angle to the clamping surface, the said bearing surface extending parallelly th the thread grooves and the clamping surfaces being inclined and converging rear rial-divtoward the bearing surface, and the said wall of't'hc groove being inclined and mnverging rearu'ardly toward the back of the chaser.

1.9. For a threading die, a chaser provided with longitudinal thread cutting teeth on one face thereof and having a longitudinal beveled bearing surface and an opposed longitudinal clamping surface With transverse serrations therein, the said surfaces converging froin thecutting end of the chaser to the opposite end.

' CHARLES F. COX. 

